Chip-scale Programmable RF Filtering Platform
In this area, we aim to develop a chip-scale programmable RF filtering platform in response to the increasing demand of frequency-agile, and function-dynamic RF front ends. Our approach features a multitude of chip-scale micro-electro-mechanical systems operating in RF, microwave, and millimeter wave frequency range.
Lithium Niobate based laterally vibrating resonators
We have developed a thin film LN technology platform for the wide-band and frequency-agile RF filtering. All MEMS laterally vibrating resonators demonstrated to date have focused on attaining high quality factor for narrowband (1%) filtering. Because of the intrinsically low electromechanical coupling, these devices cannot attain low insertion loss (IL) over the 3 dB fractional bandwidths (1 -5% FBW) required by most wireless standards. LN LVRs are enabled by a variety of micromachining techniques as a chip scale RF micro-resonator technology that can harness the high electromechanical coupling (21%) of the LN material and have lithographical defined center frequencies. These resonators are the fundamental circuit-level building blocks for reconfigurable frequency synthesis and selection. Its superior performance can be translated into unprecedented capabilities of in-field adaptation to RF ambiance on the system-level. For more info, please refer to the publications page.
Electrostatic RF-MEMS swtiches and tunable components
In order to expand the programmability of the LN-LVR base platforms without compromising the overall system lever performance, high performance RF switches are required to tune in the resonators of various frequencies and combine them with additional on-chip capacitive components for reconfiguring filter center frequency, BW, out of band rejection, and bandpass to bandstop conversion. RF-MEMS switches and tunable components offer multiple advantages over solid state switches, including the wide bandwidth, low insertion loss, low power consumption, and low parasitics.